Plunger structure and plunger pump

ABSTRACT

A plunger structure and a plunger pump are provided, relating to the technical field of plunger pumps. In one exemplary implementation, the plunger structure may comprise a plunger body with both ends closed, an engagement groove disposed at the top of the plunger body, a plunger cap fixedly connected to the engagement groove, and/or an elastic member having one end fixedly disposed within the plunger cap. The plunger body may be sheathed in the elastic member. According to other aspects, a top end of the plunger body may be exposed out from the plunger cap, an engagement groove that is depressed inwardly may be formed in a circumferential direction of the top of the plunger body, an inside of the plunger body may be in a cavity structure, and/or the plunger body may be an integrally molded part.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit/priority to Chinese Patent Application No. 201710470921.8, filed Jun. 20, 2017, published as ______, and entitled “Plunger Structure and Plunger Pump,” the contents of which are herein incorporated by reference in their entirety.

BACKGROUND Field

The present disclosure relates to the technical field of plunger pumps, and in particular to a plunger structure (plunger piston structure) and a plunger pump (plunger piston pump).

Description of the Related Art

In industrial manufacturing and daily life, the cleaning and removal of impurities from a device or an article is generally performed by using a high-pressure water gun. Among them, in the high-pressure washer industry, a power component of the washer mostly employs a plunger pump. For the plunger pump, normal operation of a body is achieved by causing a change of the sealed volume depending on a reciprocating movement of a plunger in a cylinder bore. Thus, the plunger is an important part for the normal operation of the plunger pump. The performance of the plunger directly affects the working performance of the plunger pump.

Prior plungers mainly include solid plungers and open hollow plungers. The solid plunger requires many materials and has high production cost. Moreover, the solid structure causes a heavy overall weight, which results in greater friction between the plunger and the plunger pump during working, reducing the working efficiency of the plunger pump. The open hollow plunger is easily deformed during the production process, and under a working state, the plunger body is subjected to a high-temperature and humid environment so that the inner wall is prone to rust to damage the plunger body, thus the open hollow plunger has short service life, and therefore has the technical problems of low working efficiency and short service life.

OVERVIEW OF SOME ASPECTS

Implementations of the disclosed technology provide a plunger structure and a plunger pump, to alleviate the technical problem that a hollow plunger of the prior art has low working efficiency and short service life.

According to one example, a plunger structure provided according to disclosed technology may comprise a plunger body with both ends closed, an engagement groove disposed at the top of the plunger body, a plunger cap fixedly connected with the engagement groove, and an elastic member having one end fixedly disposed within the plunger cap, wherein the plunger body is sleeved in the elastic member, and the plunger body is an integrally molded part.

According to certain implementations, a top end of the plunger body may be exposed out from the plunger cap, an engagement groove that is depressed inwardly may be formed in a circumferential direction of the top of the plunger body, and/or an inside of the plunger body may be in a cavity structure.

In additional implementations, the plunger cap may comprise a skirt portion and a plurality of triangular claws which extend upwardly and are formed along a top edge of the skirt portion.

Here, for example, the plurality of triangular claws may be circumferentially disposed at equal intervals around a centerline of the skirt portion, and the plurality of the triangular claws may all be engaged with the engagement groove.

In further implementations, the plurality of triangular claws may all converge toward the centerline of the skirt portion, and/or an aperture size of an opening delimited (defined) by the plurality of triangular claws may be equal to a diameter size of the engagement groove.

Further, the elastic member may be a spring, and one end of the spring may be engaged within the skirt portion.

Further, the plunger body may be a part integrally molded by cold forging.

Some beneficial effects of the disclosed technology include the following:

The plunger structure in the present disclosure may comprise a plunger body with both ends closed and an engagement groove disposed at the top of the plunger body, wherein the engagement groove is, e.g., formed by recessing inwardly in a circumferential direction of the top of the plunger body, and an inside of the plunger body is in a cavity structure. Since the inside of the plunger body is in a cavity structure, the weight of the plunger body is reduced, thereby reducing the inertia of the plunger structure during its operation within the plunger pump, increasing the rotational speed of the plunger pump, and increasing the self-priming property of the plunger pump, thereby improving the working efficiency of the plunger pump. Here, the plunger with an internal cavity structure also saves processing materials, thereby reducing the production cost of the plunger structure.

Moreover, according to the characteristics of sound transmission, when sound is transmitted from one medium to the next medium, if two adjacent media are made of different materials, there is a great difference in resonance frequency between the media, and then a loss of sound energy will be caused. When the plunger body is working, noise generated during the movement of the plunger body is transmitted from one side of the plunger body to air in the hollow inside, and then transmitted to the other side of the plunger body. During the process, the media adjacent to each other are different, thus the energy of sound is greatly lost, and the noise generated when the present plunger works is reduced.

In addition, the plunger body may be an integrally molded part, which prevents the plunger body from being broken under a strong working state of the plunger structure, prolongs the service life of the plunger structure, and/or thereby also allows a plunger pump to work more stably, which may also improve the working efficiency of the plunger pump, and/or enable improve practical usage and functionality.

According to the disclosed technology, a plunger pump having the plunger structure described above may be provided.

In certain implementations, the plunger pump may further comprise a pump body and a motor actuating movement of the pump body, wherein the pump body may be fixedly connected with an inlet pipe and an outlet pipe sequentially, and an overflow valve may be disposed between the inlet pipe and the outlet pipe.

In further implementations, a piston ring may be provided in the pump body, the piston ring configured to be connected with the plunger body, wherein the piston ring may comprise a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body. Further, one or both of the plunger sleeve and the piston ring body may be fixedly connected with the reinforcing rib.

Additionally, a sealing gasket may be disposed between the pump body and the plunger sleeve, such as a position or location where the pump body is connected with the plunger sleeve, or to otherwise seal a juncture between or associated with these elements.

According to some implementations, the plunger pump may further comprise a controller, a buzzer for alarm, a switch provided with a solenoid valve, a current overload protector configured to detect a current, and/or a temperature sensor configured to detect a temperature of the pump body. wherein the buzzer, the switch, the overload protector, and the temperature sensor are all electrically connected with the controller.

The beneficial effects of the technology disclosed above are as follows:

Such plunger pump has the same advantages as those of the plunger structure described above, which are incorporated here by reference.

BRIEF DESCRIPTION OF THE DRAWINGS

For illustrating technical solutions of various implementations of the disclosed technology or over the prior art more clearly, drawings required for use in the description of the specific implementations or the prior art will be introduced briefly below. Obviously, the drawings below are merely illustrative of some implementations of the present disclosure. It would be understood by those of ordinary skill in the art that other relevant drawings could also be obtained from these drawings without using inventive efforts.

FIG. 1 is a structural schematic view of a plunger structure according to an illustrative implementation of disclosed technology.

FIG. 2 is a structural schematic view showing connection between a plunger body and a plunger cap of the illustrative plunger structure in FIG. 1.

FIG. 3 is a sectional view of a plunger body of the illustrative plunger structure shown in FIG. 1.

FIG. 4 is a structural schematic view showing connection between a piston ring and a plunger structure positioned within a plunger pump according to illustrative implementations of the disclosed technology.

Reference numerals in the drawings: 1—plunger body; 2—plunger cap; 3—spring; 4—piston ring; 11—engagement groove; 21—skirt portion; 22—triangular claw; 41—piston ring body; 42—plunger sleeve; 43—reinforcing rib.

DETAILED DESCRIPTION OF ILLUSTRATIVE IMPLEMENTATIONS

Various technical solutions of the disclosed technology will be described below with reference to the accompanying drawings. The implementations described are some, but not all, of the implementations consistent with the disclosed and claimed technology. Other implementations obtained by those of ordinary skill in the art in light of the implementations of the disclosed technology without inventive efforts fall within the scope of the present disclosure as claimed.

In the description of the present disclosure, it should be noted that orientation or positional relations indicated by the terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside”, etc. are the orientation or positional relations shown based on the figures, and these terms are intended only to facilitate the description of the present disclosure and simplify the description, but not intended to indicate or imply that the referred devices or elements must be in a particular orientation or constructed or operated in the particular orientation, and therefore should not be construed as limiting the present disclosure. In addition, terms such as “first”, “second”, and “third” are used only for descriptive purpose, and should not be understood as indicating or implying to have importance in relativity.

In the description of the present disclosure, it should also be noted that unless otherwise expressly specified or defined, terms “mounted”, “coupled”, and “connected” should be understood broadly. For example, a connection may be a fixed connection, a detachable connection, or an integral connection, it may be mechanical connection or an electrical connection, or may be direct coupling or indirect coupling via an intermediate medium or internal communication between two elements. The specific meanings of such terminology in the present disclosure should be understood by those of ordinary skill in the art according to their specific usage/situations.

Implementation 1

As shown in FIG. 1, FIG. 2 and FIG. 3, the present implementation provides a plunger structure comprising a plunger body 1 with both ends closed, an engagement groove 11 disposed at the top of the plunger body 1, a plunger cap 2 fixedly connected with the engagement groove 11, and an elastic member having one end fixedly disposed within the plunger cap 2, wherein the plunger body 1 is sleeved (sheathed) in the elastic member, and the plunger body 1 is an integrally molded part.

A top end of the plunger body 1 extends or is exposed out from the plunger cap 2, the engagement groove 11 which is depressed inwardly is formed in a circumferential direction of the top of the plunger body 1, and an inside of the plunger body 1 may be formed with a cavity structure.

The plunger structure in the present implementation comprises a plunger body 1 with both ends closed and an engagement groove 11 disposed at the top of the plunger body 1. The engagement groove 11 which is depressed inwardly is formed in a circumferential direction of the top of the plunger body 1, and an inside of the plunger body 1 may have a cavity structure. Since the inside of the plunger body 1 has a cavity, the weight of the plunger body 1 is reduced, thereby reducing the inertia of the plunger structure during its operation within the plunger pump, increasing the rotational speed of the plunger pump, and increasing the self-priming property of the plunger pump, thereby improving the working efficiency of the plunger pump. Here, a plunger with an internal cavity also saves processing materials, thereby reducing the production cost of the plunger structure.

Moreover, according to the characteristics of sound transmission, when sound is transmitted from one medium to the next medium, if two adjacent media are made of different materials, there is a great difference in resonance frequency between the media, and then a loss of sound energy will be caused. When the plunger body 1 is working, noise generated during the movement of the plunger body 1 is transmitted from one side of the plunger body 1 to air in the hollow inside, and then transmitted to the other side of the plunger body 1. During the process, the media adjacent to each other are different, thus the sound energy may be greatly expended, and the noise generated when the plunger structure works is reduced.

In addition, the plunger body 1 may be an integrally molded part, which prevents the plunger body 1 from being broken under a strong working state of the plunger structure, prolongs the service life of the plunger structure, and thereby also allows a plunger pump to work more stably, improving the working efficiency of the plunger pump, and enabling good practicability and functionality.

In the present implementation, the plunger body 1 is sheathed or sleeved in the elastic member. When the plunger pump is working, the plunger body 1 moves downward. Since one end of the elastic member is fixedly disposed within the plunger cap 2, and the plunger cap 2 is fixedly connected with the engagement groove 11, the plunger body 1 drives the plunger cap 2 to move downward synchronously. During such movement, the plunger cap 2 compresses the elastic member so that the elastic member is deformed, and at the same time, the volume in the plunger pump is reduced during the downward movement of the plunger body 1, and a liquid such as water or oil or the like is conveyed out under the action of pressure difference so as to achieve the purpose of conveying the liquid such as water or oil or the like. When the plunger body 1 moves to the farthest position, since the elastic member is deformed, the plunger body 1 returns to the initial position under the action of an elastic force generated after the deformation of the elastic member, that is, one reciprocating movement of the plunger body 1 is completed. Further, here, the plunger cap 2 and the plunger body 1 may be fixedly connected together through the engagement groove 11. This structure is simple and is readily and conveniently detachable, and a damaged plunger cap 2 or elastic member can be easily replaced. The elastic member is fixedly disposed within the plunger cap 2, the elastic member is compressed when the plunger body 1 drives the plunger cap 2 through movement, and the plunger body 1 rebounds to the initial position under the elastic force generated after the deformation of the elastic member to complete the operation of the plunger pump. This is a novel design with a reasonable structure, and this further improves the functionality and practicality of the plunger structure.

As shown in FIG. 1 and FIG. 2, specifically, the plunger cap 2 may comprise a skirt portion 21 and a plurality of triangular claws 22 which extend upwardly and are formed along a top edge of the skirt portion 21.

The plurality of triangular claws 22 may be disposed circumferentially at equal intervals around a centerline of the skirt portion 21, and the plurality of triangular claws 22 are all engaged with the engagement groove 11.

In the present implementation, the plunger cap 2 may comprise a skirt portion 21 and a plurality of triangular claws 22 which extend upwardly and are formed along a top edge of the skirt portion 21. The plurality of triangular claws 22 may be engaged with the engagement groove 11, and the elastic member is fixedly disposed within the skirt portion 21. When the plunger body 1 drives the plunger cap 2 to move downward synchronously, the skirt portion 21 compresses the elastic member so that the elastic member is deformed, and at the same time, the elastic member gives the skirt portion 21 an upward acting force, thereby allowing tight abutment of the plurality of triangular claws 22 against the engagement groove 11, to ensure that the plunger cap 2 and the plunger body 1 are firmly connected together, and to prevent the plunger cap 2 from being disengaged from the engagement groove 11 during the movement of the plunger body 1, thereby further improving the functionality and practicality of the plunger body 1.

With continued reference to FIG. 1 and FIG. 2, here in the present implementation, the plurality of triangular claws 22 may all converge toward the centerline of the skirt portion 21, and an aperture size of an opening delimited by the plurality of triangular claws 22 may be equal to a diameter size of the engagement groove 11. Since the aperture size of the opening delimited by the plurality of triangular claws 22 is equal to the diameter size of the engagement groove 11, when the plurality of triangular claws 22 are engaged with the engagement groove 11, the plurality of triangular claws 22 all have the tendency of expanding outwardly, that is, the plunger cap 2 is tightly fixed together with the engagement groove 11 under the action of a tension generated by the triangular claws 22, further improving the firmness of the connection between the plunger cap 2 and the plunger body 1 and preventing disengagement of the plunger cap 2 from the plunger body 1 during the reciprocating movement of the plunger body 1.

In the illustrative implementation(s) shown, the elastic member may be a spring 3, and one end of such spring 3 may engaged within the skirt portion 21. During the movement of the plunger body 1, the plunger cap 2 compresses the spring 3 so that the spring 3 is deformed, and at the same time, the plunger body 1 presses the cavity in the plunger pump so that the volume in the plunger pump is reduced, thereby achieving the purpose of conveying a medium. When the plunger body 1 moves to the farthest position, where the elastic member is deformed, the plunger body 1 returns to the initial position under the action of an elastic force generated after the deformation of the elastic member, that is, one reciprocating movement of the plunger body 1 is completed. In addition, such spring 3 is a mechanical part that works using elastic property, and has a characteristic that it deforms under the action of an external force and restores its original shape after the external force is removed. With such characteristic of the spring 3, the movement of the mechanism can be well controlled to realize the function of returning to an initial position of the mechanism.

Further, consistent with the present implementation, the plunger body 1 may be a part integrally molded by cold forging. Cold forged molding can enable/realize large-scale production and has the characteristics of short processing period, simple operation, and low manufacturing cost. Moreover, cold forged molding enables one-step molding of a product during processing of the product, avoiding the deformation of the product caused by heat during the production process.

In accord with present implementation(s), the plunger body 1 may be processed by the following procedures. First, a plunger blank may be molded in one step by a cold forging process and an open hollow plunger blank is formed. After the hollow plunger blank is molded, an opening of the plunger blank is subjected to sealing treatment by performing high-frequency or intermediate-frequency localized heating and roller-extrusion sealing process (i.e., a process of high-frequency or intermediate-frequency localized heating, roller extruding and sealing) at one end of the plunger blank having the opening. And, after the sealing treatment of the opening of the plunger body 1 is completed, an engagement groove 11 is processed at the top of the plunger blank, e.g., by a turning process, so as to complete the processing and manufacture of the final molded plunger body 1.

Implementation 2

In this second implementation, a plunger pump is provided having the plunger structure described in Implementation 1, above.

Such plunger pump includes the same advantages as those described above regarding the aforementioned plunger structure, said advantages being incorporated into this implementation, as well.

According to this present implementation, the plunger pump further comprises a pump body and a motor actuating movement of the pump body. The pump body may be fixedly connected with an inlet pipe and an outlet pipe sequentially, and an overflow valve is disposed between the inlet pipe and the outlet pipe.

According to the present implementation, when the plunger pump is working, the medium flows from the inlet pipe, through the pump body and then out of the outlet pipe. Here, an overflow valve may be disposed between the inlet pipe and the outlet pipe. The overflow valve may also have a unidirectional flowing mechanism and/or characteristic, such that a liquid such as water or oil or the like cannot flow back from the outlet pipe into the pump body. This prevents damage to the pump body caused by the backflow of the liquid such as water or oil or the like, and at the same time, ensures the outflow of all the liquid such as water or oil or the like through the outlet pipe and improves the working efficiency of the pump body.

As shown in FIG. 4, here, the pump body is provided therein with a piston ring 4 for connection to the plunger body 1. The piston ring 4 may comprise a piston ring body 41, a plunger sleeve 42 positioned inside the piston ring body 41, and a reinforcing rib 43 positioned between an outer wall of the plunger sleeve 42 and an inner wall of the piston ring body 41. One or both the plunger sleeve 42 and/or the piston ring body 41 may be fixedly connected with the reinforcing rib 43.

Consistent with the present implementation, when the plunger pump is working, the plunger body 1 may move downward along the plunger sleeve 42 and drive the plunger cap 2 to move downward synchronously. During the downward movement of the plunger body 1, the skirt portion 21 compresses the spring 3 so that the spring 3 is deformed, and the plunger sleeve 42 can ensure that the plunger body 1 does not deviate from the movement track, and at the same time can prevent swinging of the plunger body 1 during the movement, thereby improving the operation stability and working efficiency of the plunger pump. As such, according to some aspects, the reinforcing rib 43 improves the strength of the entire piston ring 4 and prolongs the service life of the entire piston ring 4.

Here, in the present implementation, the pump body and the plunger sleeve 42 may be connected with each other at a position where a sealing gasket is disposed. The sealing gasket may ensure air-tightness at a position where the pump body is connected with the plunger sleeve 42, so as to ensure enough pressure inside the pump body during working of the plunger pump to prevent the situation that outflowing amount of the liquid such as water or oil or the like at the outlet pipe is relatively small due to insufficient internal pressure during the working of the pump body, thereby further improving the working efficiency of the plunger pump.

Consistent with the present implementation, the sealing gasket may be a silicone gasket. Such silicone gasket has good ductility, air-tightness, has non-toxic and odorless characteristics, is low-carbon, environmentally friendly, has a very clean and sanitary surface, is inexpensive in price, and has a wide range of sources available in the market.

Further, the plunger pump may further comprise a controller, a buzzer for alarm, a switch provided with a solenoid valve, a current overload protector for detecting the current, and/or a temperature sensor for detecting the temperature of the pump body. The buzzer, the switch, the overload protector, and/or the temperature sensor are all electrically connected with the controller.

In the present implementation, when the plunger pump is working, the maximum current value that can be tolerated when the plunger pump is in operation may be set in the current overload protector. Here, for example, when the current in the circuit exceeds the set value in the current overload protector, the current overload protector may send a signal to the controller, and the controller receives the corresponding signal and then takes an action. The controller may control the solenoid valve to be closed so as to cut off a power switch of the plunger pump to prevent damage, such as over-burning, etc., of the pump body which may cause heat incidents or damage and even a fire accident in a serious case. As such, the safety of the plunger pump is thereby improved.

Moreover, the plunger pump may further comprise a temperature sensor, wherein the highest temperature value at which the plunger pump works is set in the temperature sensor. When the temperature value of the pump body exceeds the set value of the temperature sensor, the temperature sensor sends a signal to the controller, and the controller receives the corresponding signal and then takes an action. The controller may instruct the buzzer to give an alarm for warning and alerting to prevent damage to the pump body due to an excessive temperature so as to further improve the practicability and functionality of the plunger pump.

Finally, it should be noted that the above implementations are only intended to illustrate, but not limit, the inventiveness and technical solutions of the disclosed technology. Although the present disclosure has been described in detail with reference to the foregoing implementations, it should be understood by those of ordinary skill in the art that it is still possible to modify aspects and/or technical solutions described in the foregoing implementations or equivalently replace some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding systems and/or methods to depart from the scope of innovations or the technical solutions of the implementations of the disclosed technology. 

What is claimed is:
 1. A plunger structure, comprising a plunger body with both ends closed, an engagement groove provided at a top of the plunger body, a plunger cap fixedly connected with the engagement groove, and an elastic member having one end fixedly provided within the plunger cap, wherein the plunger body is sleeved in the elastic member, and the plunger body is an integrally molded part; and a top end of the plunger body is exposed out from the plunger cap, the engagement groove which is depressed inwardly is formed in a circumferential direction of the top of the plunger body, and an inside of the plunger body is in a cavity structure.
 2. The plunger structure according to claim 1, wherein the plunger cap comprises a skirt portion and a plurality of triangular claws which extend upwardly and are formed along a top edge of the skirt portion; the plurality of triangular claws are circumferentially disposed at equal intervals around a centerline of the skirt portion, and the plurality of the triangular claws are all engaged with the engagement groove.
 3. The plunger structure according to claim 2, wherein the plurality of triangular claws all converge toward the centerline of the skirt portion, and an aperture size of an opening delimited by the plurality of triangular claws is equal to a diameter of the engagement groove.
 4. The plunger structure according to claim 3, wherein the elastic member is a spring, and one end of the spring is engaged within the skirt portion.
 5. The plunger structure according to claim 3, wherein the plunger body is a part that is integrally molded by cold forging.
 6. The plunger structure according to claim 4, wherein the plunger body is a part that is integrally molded by cold forging.
 7. A plunger pump, comprising a plunger structure, wherein the plunger structure comprises a plunger body with both ends closed, an engagement groove provided at a top of the plunger body, a plunger cap fixedly connected with the engagement groove, and an elastic member having one end fixedly provided within the plunger cap, wherein the plunger body is sleeved in the elastic member, and the plunger body is an integrally molded part; and a top end of the plunger body is exposed out from the plunger cap, the engagement groove which is depressed inwardly is formed in a circumferential direction of the top of the plunger body, and an inside of the plunger body is in a cavity structure.
 8. The plunger structure according to claim 7, wherein the plunger cap comprises a skirt portion and a plurality of triangular claws which extend upwardly and are formed along a top edge of the skirt portion; the plurality of triangular claws are circumferentially disposed at equal intervals around a centerline of the skirt portion, and the plurality of the triangular claws are all engaged with the engagement groove.
 9. The plunger structure according to claim 8, wherein the plurality of triangular claws all converge toward the centerline of the skirt portion, and an aperture size of an opening delimited by the plurality of triangular claws is equal to a diameter of the engagement groove.
 10. The plunger structure according to claim 9, wherein the elastic member is a spring, and one end of the spring is engaged within the skirt portion.
 11. The plunger structure according to claim 9, wherein the plunger body is a part that is integrally molded by cold forging.
 12. The plunger structure according to claim 11, wherein the elastic member is a spring, and one end of the spring is engaged within the skirt portion.
 13. The plunger pump according to claim 7, further comprising a pump body and a motor configured for actuating movement of the pump body, wherein the pump body is fixedly connected with an inlet pipe and an outlet pipe sequentially, and an overflow valve is disposed between the inlet pipe and the outlet pipe.
 14. The plunger pump according to claim 13, wherein the pump body is provided with a piston ring connected to the plunger body, the piston ring comprises a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body, and both the plunger sleeve and the piston ring body are fixedly connected with the reinforcing rib.
 15. The plunger pump according to claim 13, wherein the pump body and the plunger sleeve are connected with each other at a position where a sealing gasket is provided.
 16. The plunger pump according to claim 15, wherein the pump body is provided with a piston ring connected to the plunger body, the piston ring comprises a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body, and both the plunger sleeve and the piston ring body are fixedly connected with the reinforcing rib.
 17. The plunger pump according to claim 15, further comprising a controller, a buzzer for alarm, a switch provided with a solenoid valve, a current overload protector configured to detect a current, and a temperature sensor configured to detect a temperature of the pump body, wherein the buzzer, the switch, the overload protector, and the temperature sensor are all electrically connected with the controller.
 18. The plunger pump according to claim 8, further comprising a pump body and a motor configured for actuating movement of the pump body, wherein the pump body is fixedly connected with an inlet pipe and an outlet pipe sequentially, and an overflow valve is disposed between the inlet pipe and the outlet pipe.
 19. The plunger pump according to claim 18, wherein the pump body is provided with a piston ring connected to the plunger body, the piston ring comprises a piston ring body, a plunger sleeve positioned inside the piston ring body, and a reinforcing rib positioned between an outer wall of the plunger sleeve and an inner wall of the piston ring body, and both the plunger sleeve and the piston ring body are fixedly connected with the reinforcing rib.
 20. The plunger pump according to claim 19, wherein the pump body and the plunger sleeve are connected with each other at a position where a sealing gasket is provided; and further comprising a controller, a buzzer for alarm, a switch provided with a solenoid valve, a current overload protector configured to detect a current, and a temperature sensor configured to detect a temperature of the pump body, wherein the buzzer, the switch, the overload protector, and the temperature sensor are all electrically connected with the controller. 